hmm Though I don't know what you are talking about but think about this...

What happens if you release gas in vacuum? Till what point would they expand?

If there is no movement (to move the gas around) will these particle go away from each other totally or will they stay in each other's gravitational pull? (Even small items surely have gravity, including atom, though we haven't found Quantum Gravity yet).

Now if these particles don't go beyond the pull of other particle, it clear that particles won't go out of the edge (lets call it Event Horizon of Universe), but if these particles could go beyond the attraction of other particle than surely the particle could go out of universe in true vacuum.

I don't know answer to my question so I can't answer that, I don't know of any experiments done to check that.

No normally if the body like flash light or rocket isn't moving toward you or you moving toward the body emitting light it wouldn't be blue shifted.

When it comes to this part we have to consider light as waves, thus moving toward it would compress the waves and it would be blue shifted. While if these objects are moving away from you than it would be red shifted, that is wave expansion.

Now light itself has a constant speed so if light isn't emitted by a source that isn't moving relative to the source that is receiving the lighting it wouldn't have any shift.

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